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Top actress Yun Ha Na has everything — until a freak accident swaps her soul into her twin brother's body and drops her back in the past. Given an impossible second chance, she sets out to save Jung U Jae, the former judo prodigy and first love who once died protecting her. Meanwhile, her brother wakes up trapped in his sister's life entirely, and their agency CEO — quietly devoted to him, seemingly untouchable to everyone else — finds her own carefully built walls starting to crack.